Oceans face 'deadly trio' of threats, study says

OSLO Thu Oct 3, 2013 4:56am EDT

A whale dives into sea off the coast of Greenland's capital Nuuk October 17, 2012. REUTERS/Alistair Scrutton

A whale dives into sea off the coast of Greenland's capital Nuuk October 17, 2012.

Credit: Reuters/Alistair Scrutton

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OSLO (Reuters) - The world's oceans are under greater threat than previously believed from a "deadly trio" of global warming, declining oxygen levels and acidification, an international study said on Thursday.

The oceans have continued to warm, pushing many commercial fish stocks towards the poles and raising the risk of extinction for some marine species, despite a slower pace of temperature rises in the atmosphere this century, it said.

"Risks to the ocean and the ecosystems it supports have been significantly underestimated," according to the International Programme on the State of the Ocean (IPSO), a non-governmental group of leading scientists.

"The scale and rate of the present day carbon perturbation, and resulting ocean acidification, is unprecedented in Earth's known history," according to the report, made with the International Union for Conservation of Nature.

The oceans are warming because of heat from a build-up of greenhouse gases in the atmosphere. Fertilizers and sewage that wash into the oceans can cause blooms of algae that reduce oxygen levels in the waters. And carbon dioxide in the air can form a weak acid when it reacts with sea water.

"The ‘deadly trio' of ... acidification, warming and deoxygenation is seriously affecting how productive and efficient the ocean is," the study said.

Alex Rogers of Oxford University, scientific director of IPSO, told Reuters scientists were finding that threats to the oceans, from the impacts of carbon to over-fishing, were compounding one another.

"We are seeing impacts throughout the world," he said.

EXTINCTIONS

Current conditions in the oceans were similar to those 55 million years ago, known as the Paleocene-Eocene thermal maximum, that led to wide extinctions. And the current pace of change was much faster and meant greater stresses, Rogers said.

Acidification, for instance, threatens marine organisms that use calcium carbonate to build their skeletons - such as reef-forming corals, crabs, oysters and some plankton vital to marine food webs.

Corals might cease to grow if temperatures rose by 2 degrees Celsius (3.6F) and start to dissolve at 3 degrees (5.4F), the study said.

Scientists said the findings added urgency to a plan by almost 200 governments to work out a deal by the end of 2015 to limit a rise in average world temperatures to less than 2 degrees Celsius (3.6F) above pre-industrial times.

Temperatures have already risen by about 0.8 degree Celsius (1.4F). The report also urged tougher management of fish stocks including a ban on destructive bottom trawlers and granting more power to local communities in developing nations to set quotas.

Last week, a report by the U.N.'s Intergovernmental Panel on Climate Change (IPCC) raised the probability that mankind was the culprit for most global warming to 95 percent, from 90 in a report in 2007.

The Global Ocean Commission, a group of politicians working to advise governments, urged stronger action.

"If the IPCC report was a wake-up call on climate change, IPSO is a deafening alarm bell on humanity's wider impacts on the global ocean," said Trevor Manuel, co-chair of the Commission and minister in the South African Presidency.

(Reporting By Alister Doyle, editing by Elizabeth Piper)

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Comments (12)
OnAnIsland wrote:
Maybe a more imitate threat than the centuries long global warming (it started with the Romans burning limestone) is the radiation levels in the North Pacific from the Fukushima reactor leak. Based on a French study of the first months effects published last month, it can be conservatively estimated that radiation levels on the West coast of the US could reach 600 becquerels by 2015. This is supposedly equivalent to 20 to 30 chest x-rays per year. The effect could last for at least 10 years at these levels. The gulf of Alaska should expect even higher levels for prolonged periods of time afterwards. These estimates are based on the containment of waste water from the Japanese plant which has not yet been accomplished.

Oct 05, 2013 5:53pm EDT  --  Report as abuse
jrpardinas wrote:
We’re turning the oceans into sewage and the land masses into garbage dumps.

Might as well let the Japanese eat all the whales and the Chinese all the sharks (i.e. fins).

Oct 05, 2013 5:58pm EDT  --  Report as abuse
Vuenbelvue wrote:
They could try to dump train car loads of Coors beer into the ocean at certain locations to cool the water down.

Oct 05, 2013 9:52pm EDT  --  Report as abuse
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